User's Manual 47. Automatic Provisioning
Version 6.8 657 Mediant 500L MSBR
47.2.7 Cyclic Redundancy Check on Downloaded Configuration Files
You can enable the device to perform cyclic redundancy checks (CRC) on downloaded
configuration files (Startup Script or CLI Script) during the Automatic Update process. The
CRC checks whether the content (raw data) of the downloaded file is different to the
content of the previously downloaded file from the previous Automatic Update process. The
device compares the CRC check value (code) result with the check value of the previously
downloaded file. If the check values are identical, it indicates that the file has no new
configuration settings, and the device discards the file. If the check values are different, it
indicates that the downloaded file is different (i.e., includes updates), and the device
installs the downloaded file and applies the new configuration settings.
CRC is useful, for example, when the service provider replaces a file, on the provisioning
server, with another file whose contents are the same. When the device sends an HTTP
Get request during the Automatic Update process, the provisioning server sends the new
file to the device. This occurs as the timestamp between the previously downloaded file
and this new file is different (determined by the HTTP If-Modified-Since header in the Get
request). Therefore, the CRC feature can be used to prevent the device from installing
such files.
For enabling CRC, use the ini file parameter AUPDCheckIfIniChanged or CLI command,
configure system > automatic-update > crc-check regular. By default, CRC is disabled. For
more information on the parameter, see ''Automatic Update Parameters'' on page 792.
47.2.8 MAC Address Automatically Inserted in Configuration File Name
You can configure the file name of the configuration file (Startup Script, and CLI Script) in
the URL to automatically include the MAC address of the device. As described in ''File
Location for Automatic Update'' on page 651, the file name is included in the configured
URL of the provisioning server where the file is located.
Including the MAC address in the file name is useful if you want the device to download a
file that is unique to the device. This feature is typically implemented in mass provisioning
of devices where each device downloads a specific configuration file. In such a setup, the
provisioning server stores configuration files per device, where each file includes the MAC
address of a specific device in its file name.
To support this feature, you need to include the case-sensitive string, "<MAC>" anywhere
in the configured file name of the URL, for example:
(automatic-update)# cli-script https://company.com/files/cli_script_<MAC>.txt
(automatic-update)# startup-script https://company.com/files/startup_<MAC>.txt
The device automatically replaces the string with its hardware MAC address, resulting in a
file name request that contains the device's MAC address, for example,
startup_00908F033512.txt. Therefore, you can configure all the devices with the same URL
and file name.
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